Ten sorghum genotypes (Sorghum bicolor L. Moench) were evaluated at three locations namely; Arab El-Awamer, Shandweel, and El-Fayoum Agric. Res. Stations in 2018 and 2019 growing seasons. Planting time at the three locations during the two years were during the 1 st week of July. The objectives of this study were to determine the performance and stability of ten sorghum across different locations of Egypt. The study was conducted using a randomized complete block design with four replications. Stability analysis for grain yield, 1000-grain weigh, plant height and days to 50% flowering were estimated using Tai's statistical method. A combined analysis of variance emphasized the significant effect of genotypes and locations for all studied traits. There was nonsignificant effect of year for all studied traits, except for 1000-grain weight. The effect of location on Sorghum grain yield and the other studied traits was greater than the effect of year. Hence, testing genotypes under many locations should be done rather than years. Significant effect of genotype x location interaction, suggesting that each genotype differentially responded to the change in the investigated locations. Based on Tai's stability analysis, 3 out of 10 tested sorghum genotypes i.e., (ASH-8 x ICSR-93002), (ASH-9 x ICSR-93002), and (ASH-12 x ICSR-93002) showed average stability and gave high yielding compared to the general mean and are thus the most stable grain sorghum genotypes for grain yield. Generally, Tai's stability method was facilitated the visual comparison and identification of superior genotypes, thereby supporting decisions grain sorghum genotypes for different environments.

This study was carried out during 2019 and 2020 seasons at Arab El-Awamer Station, Assiut, Egypt to examine the effect of foliar application of humic and fulvic acids with 25 ml/L to improve soil properties with mineral nitrogen at 100% and 75% of the recommended dose on grain yield and its components. Humic and fulvic acids applied were individually or in combination of them at a ratio of 1:1 with N 75%. The obtained results showed that significant or highly significant effect between the genotypes for plant height and panicle length at two seasons. While the genotypes had a significant effect on grain ard / fed in the first season. The genotype hybrid Shandaweel-1 exhibited better results than the genotype hybrid -306 in most of the studied traits. Results of the present study also show that all the studied traits were significantly affected by the fertilization treatments. Among the fertilization treatments applied the treatment (N 75% + H + F) recorded the highest value s for most of the studied parameters. The interaction between genotypes and treatments had a significant effect on the days to 50% flowering in the second season, while on 1000-kernel weight the interaction between genotypes and treatments had a significant effect in the first season. From the above results it could be recommended economically using of (N 75% + H + F), thus we could save 25 % of the recommended dose of N and improve soil properties.

Path coefficient was computed to estimate the contribution of individual traits to yield in grain sorghum .An investigation was carried out with 24 restorer lines of sorghum and one check variety Dorado to asses association of grain yield components and their direct and indirect effects on grain yield/plant during 2019 and 2020 growing seasons at Shandweel Agric. Res. Station, Egypt under four levels of nitrogen fertilization (60, 80 .100 .120 kg N / fed). Results of combined analysis of variance showed that significant or highly significant variations were recorded for environments, genotypes, and their location for various studied morphological and yield traits. The results of correlation analysis indicated that 1000-grain weight, panicle length, panicle width and plant height positive and significant correlation with grain yield. Plant height had maximum positive direct effect on grain yield/plant followed by 1000-grain weight. The best genotype was Rsh-19 for grain yield / plant , Rsh-22 for 1000-grain weight , Adv-44 for panicle width , Rsh-20 for panicle length , Sel pop-13 for earliness and Rsh-12 for plant height. The highest mean values for all traits except days to 50% flowering were obtained under high nitrogen level (120 Kg N/fed) in both two seasons while the reverse was obtained under low nitrogen level (60 Kg N/ fed) in both two growing seasons.